The (or EM spectrum) represents the entire distribution of electromagnetic radiation according to or . This distribution covers a vast range of frequencies and wavelenghts, and it is divided into subranges (portions of the EM spectrum).

The order of these subranges - either from lowest to highest frequency, or from longest to shortest wavelenght - is: Radio, Microwave, Infrared, Visible, Ultraviolet, X-Ray, and Gamma Ray.

So, for the visible range, the colors are arranged in order of increasing frequency like this: Red < Orange < Yellow < Green < Blue < Indigo < VIolet

Here are a picture of the EM spectrum with emphasis on the visible range :

and a picture that depicts the frequencies associated with each color

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